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Arts, Travel & Entertainment / Help With This Home Theater

URL:  http://boards.fool.com/not-to-go-on-and-on-about-this-yet-in-the-past-30291192.aspx

Subject:  Re: New sub Date:  9/30/2012  2:40 AM
Author:  MichaelRead Number:  9615 of 10547

Not to go on and on about this yet in the past several hours I’ve played ‘stuff’ to see how the new sub affects the system. It does and there’s a reason why: much said about subs and their placement is dated – much of it can be discounted.

Back in the day (1979) I created the equilateral plywood triangle which, placed in the upper corner of a room, reduces corner echo. However, some – and this includes sub manufacturers – say corner placement ‘improves’ bass. It doesn’t. All it does is add echoic confusion. This confusion affects all other speakers as they compete in this confusion. The answer, say some, is add room diffusers and while in some rooms they do help what they’re helping at is reduce induced confusion caused by low frequency waves reverberating in corners. Plus corner placement causes standing waves in turn causing null spots in the listening room. Now you see why I don’t like placing subs close to walls and especially corner walls.

One way to place a sub is have it on the main seating area and walk around the room seeking a good bass response and then place the sub where that happened. That is, my view, not that which give good bass but louder bass. Better, since sub electronics have greatly improved in the past ten years, is place the sub near the mains wherever they are placed. Modern subs such as the Velodyne have parametric level control and that can compensate for where the sub is actually placed.

The other dated concept is that subs are non-directional and it doesn’t matter where they’re placed because they are non-directional. However, my experience, a sub should be treated as any other speaker: focused on the listening area. My two subs are toed in as are the mains, matching their placement and it has made a difference. When they were parallel to the long walls of my listening room they were not as effective.

Point I’m making is sub placement, these days, isn’t as once was. A sub jammed into a corner doesn’t give what a good sub can do: a clear un-muddied bass.

So what should a sub do? Sure, increase the total frequency range yet most written about subs was before the advanced Dolby and DTS codecs which separate the low frequencies and there’s more emphasis on lows . If these lows reverb because of corner echo then it isn’t doing what it can.

Thoughts?

MichaelR
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